If you wish to use these protobufs, you must generate their source files using protoc from the protobuf project (https://github.com/google/protobuf). ----- Troubleshooting for Protobuf: Install: If you are getting permission errors install, make sure you are not trying to install from an NFS. Running protoc: protoc: error while loading shared libraries: libprotobuf.so.0: cannot open shared object file: No such file or directory The issue is that Ubuntu 8.04 doesn't include /usr/local/lib in library paths. To fix it for your current terminal session, just type in export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib